容灾技术在移动智能网中的应用研究

容灾技术对于关键业务服务系统的运行保障有非常重要的作用.本文首先介绍了容灾体系的构成及其关键技术--远程数据复制,然后结合电信网络中的关键业务系统--移动智能网,对容灾技术的应用进行了分析,提出了基于数据库实现远程数据复制的移动智能网容灾方案,最后还对容灾技术的发展趋势及其在移动智能网中的应用前景进行了简要介绍.     

基于数据流的容灾技术的研究

提高分布式网络应用系统的容灾能力一直是近几年来人们关注的焦点。本文经过对现有容灾技术的讨论,又分析了分布式网络系统的数据交换过程,设计了一种基于数据流的通用容灾体系。提出了数据流复制以及数据流回放的容灾新理念,通过使用数据交互状态描述法以及增加灾备控制协议等关键技术,使容灾系统和正常业务系统的应用层工作分离开来,增强了系统的通用性和灵活性。并对该系统做了可行性分析,指出了该系统应用的前提条件。     

基于存储虚拟化数据复制及恢复实现异地容灾技术在吐哈油田的应用

随着信息化建设发展,吐哈油田勘探、开发、综合等各类数据资产的安全日趋重要。本文从现状分析入手,针对现有系统容灾需求,从众多容灾技术中选择了基于存储虚拟化数据复制及恢复技术,详细对比了两款基于虚拟存储技术进行容灾建设的产品,提出了产品选择参考意见,通过容灾系统建设,提升了吐哈油田公司数据资产安全性。     

基于iSCSI技术实现的远程数据容灾系统模型分析

数据容灾系统的关键技术是远程数据复制技术,而基于iSCSI技术实现的远程数据容灾系统可以很好地保证远程数据复制工作的进行,在灾难发生时能最大限度地保护系统数据．保护客户利益。文章阐述了应用容灾和数据容灾的基本概念,讨论了数据容灾系统中的关键技术——同步与异步数据复制的工作原理,分析了基于iSCSI技术实现的远程数据容灾系统模型的工作过程。     

容灾系统中远程数据复制技术讨论与应用

本文重点阐述了在越来越依赖电子信息化的时代,容灾备份系统的重要性。详细介绍了容灾系统中的核心技术:远程数据复制的几种技术及各自的优缺点,并对这几种技术进行了比较,便于大家在建设容灾备份系统时可以根据各种情况进行综合评比,在不同的环境下选择合适的方案。最后,简单介绍了东方有线支撑业务系统的应急节点中的数据复制技术的应用。     

大型企业信息系统容灾研究与实现

本文系统地介绍了容灾理论和容灾系统等级的划分,提出了适用于大型企业信息系统容灾建设的系统模型。通过容灾系统模型在神华集团邮件系统应用级容灾中的具体应用,解决了神华集团重要信息系统业务连续性问题,极大地增强了企业信息系统的风险防范能力,显著地提高了企业信息系统的数据安全性。     

数据容灾系统的原型设计及实现

提出了一个数据备份和恢复的数学模型,并在其基础上设计和实现了基于Windows平台远程逻辑卷容灾系统的原型,重点论述了该系统实现的基本原理、灾难恢复流程以及对应的关键技术设计.实验证明,该数据容灾系统较好地保证了数据一致性和系统可用性.     

SVC存储虚拟化在容灾系统中的应用研究

本文结合已实施完成的容灾系统建设项目,介绍了基于SVC存储虚拟化的数据复制技术在容灾系统中的建设方案和实施方法,并对该应用方式的特点进行了分析总结.     

智能网容灾系统关键技术研究

随着电信业务的广泛应用,客户信息和业务处理的高度集中,促使电信运营商对电信业务支撑系统的容灾能力提出了越来越高的要求。叙述了容灾系统建设、基线建立、数据同步、灾难切换、业务恢复等若干重要环节,将容灾运用于生产实践中。     

本地备份和异地容灾系统建设研究

阐述了一个本地备份和异地容灾系统的建设方案。通过本方案的实施,为目前学校的核心应用数据提供了在线实时备份,也为部分其它应用系统提供了数据备份服务;实现了校本部中心数据库、办公等重要数据到容灾中心的同步镜像,并为这些应用中的重要模块建立异地应用备份,当本地应用发生致命错误或不可预料的灾难时,通过容灾中心对应用的接管,保护核心应用系统的连续运行。     

The augmented data vortex switch fabric: An all-optical packet switched interconnection network with enhanced fault tolerance

Optical Multistage Interconnection Networks (OMINs) are capable of transmitting terabits of bandwidth per second, and they have been considered as possible solutions to the electronic communications bottleneck in interconnection networks. A novel architecture, the Data Vortex (DV) switch, has been proposed by Yang et al., as a scalable, ultra low latency, ultra high capacity, high throughput, low cross-talk and low BER, all-optical packet switching fabric that is a suitable candidate for use as an OMIN. For any interconnection network, its fault tolerance and reliability are crucial issues, which have lacked attention up to now in the case for a DV switch. In this paper we, therefore, present results of fault tolerance and reliability analysis of the primary DV switch, and propose (1) a new Augmented Data Vortex (ADV) switch fabric, to improve the fault tolerance of the primary DV switch. (2) The labelling and a numbering scheme, with detailed interconnections of nodes for the ADV switch is given. (3) A new self-routing procedure and a priority scheme for distributed control signalling in the ADV switch have been given. (4) For the first time, conversion of the 3-dimensional switch to an equivalent chained-MIN model, has been given, which is more suitable for later analysis of fault tolerance. (5) A multiplexing scheme at input ports and output ports which further enhances the fault tolerance of the ADV switch has been given. (6) Computation has been done of the reliability and fault tolerance of the new architecture via an analytical model. (7) Finally, comparison of the ADV switch architecture with the primary architecture (DV) in view of fault tolerance and reliability has been given, and hardware complexity and cost effectiveness have been studied.     

Performance evaluation of the augmented data vortex switch fabric: An all-optical packet switched interconnection network

Modern high-performance computing systems require networks with high capacity, extremely high throughput and low latency in order to pass messages between thousands of processors and memory elements. Optical Interconnection Networks (OIN) offer a potentially viable solution to this requirement. An all-optical packet switched interconnection network called a Data Vortex (DV) switch has already been proposed by Yang et al. for the purpose of large scale photonic interconnections. For any interconnection network, fault tolerance and reliability are crucial issues, evaluation of which lacked attention for the case of the DV switch. In our earlier work we therefore presented the results for fault tolerance and reliability analysis of the primary DV switch. We also proposed a new Augmented Data Vortex (ADV) switch fabric, to improve the fault tolerance of the primary DV switch. The performance as regards fault tolerance of the ADV switch was computed and detailed results were obtained. In this paper, performance of ADV is investigated with reference to parameters such as latency and injection ratio (throughput) by means of numerical simulations. A uniform random traffic model has been used for the performance evaluation. The results obtained are compared with the results reported for the DV switch. The results show that the ADV switch with enhanced fault tolerance also improves the performance regarding latency. For same switch sizes (i.e. the same number of angles A, and height H) the injection ratios (throughput) for the DV and the ADV switches are comparable. Hence it can serve as a suitable candidate for high performance computing.     

Low-power pulsed hybrid flip-flop based on a C-element

This paper presents a new flip-flop design featuring implicit pulse-triggered structure in which a dynamic front-end stage and a static back-end one are adopted, thereby, it is considered as a hybrid flip-flop possessing both low-power and high-performance targets. Proposed flip-flop is implemented by a sampling circuit, a C-element for rise and fall paths, and a keeper stage. Simulation results in 45 nm CMOS technology with a 1 V supply voltage demonstrate that 27.8% and 16.9% reductions in terms of power consumption as compared to all other reported flip-flop designs in 25% and 50% data activities, respectively. Moreover, utilizing only four clocked transistors along with transition condition technique make proposed design fast and power-efficient in all activity factors, and exhibiting 5% enhancement in speed. Hence, other exploitable advantage of presented design is power-delay-product (PDP_DQ) index whose improvement ranges from 16.7% to 56%. It is also indicated that presented scheme having negative setup time near zero and considrable hold time contains only 17 transistors severely affecting layout area efficiency being by as much as 12%. More importantly, Monte-Carlo simulations confirm proposed topology gains substantial variation tolerance in power dissipation and PDP_DQ metrics.     

A Channel based Fair Scheduling Scheme for Downlink Data Transmission in TD-CDMA Networks

High speed data transmission in wireless networks demands better radio resource management schemes. A fair packet scheduling is proposed for downlinks of a cellular TD-CDMA system for delay-tolerant applications. It is based on the combined consideration of channel conditions, required throughput and achieved average throughput. A system dependent parameter is introduced to control the maximum achievable date rate as well as the degree of fairness. Through analysis and simulation, we study the tradeoff between system throughout (i.e., efficiency) and individual throughput (i.e., fairness). The relative performance between the proposed scheme and the traditional schemes is evaluated through simulation to confirm the analytical observations. The sensitivity of the system tolerance factor towards efficiency and fairness is also investigated.

Informix数据仓库及在电信业的应用

数据仓库是为企业管理的决策者提供支持服务的计算机应用系统。数据仓库涉及数据的收集、数据存储与管理、联机分析正理２以及决策支持开发诮子库的最是通过数据挖掘和数据库知识发现来满足最终用户的商业需求。本文对Ｉｎｆｏｒｍｉｘ的产品及解决方案进行了详细的说明,并提及了电信业中的应用。     

基于模糊C均值聚类算法与隶属算法的容差电路软故障诊断

在聚类分析与隶属函数的基础上,提出了一种容差电路软故障诊断的新算法。对于含有容差元件的的模拟电路,由于允许电路参数在一定范围内偏离理想值,所以很难判断电路是处于正常容差状态,还是软故障状态。本文首先简述了模糊C均值（Fuzzy C-means, FCM）聚类算法与模糊控制隶属算法的基本原理。然后通过一个容差电路软故障诊断实例,以验证本文算法的有效性:首先确定容差电路的正常状态与软故障状态种类,对每一种状态进行电路仿真,获取将来进行聚类分析与故障诊断的样本。然后对采集样本进行聚类分析,利用模糊C均值聚类算法将各种状态分类,并且得到所有状态的聚类中心。最后随机模拟一种电路状态,利用模糊隶属算法,计算当前电路状态与各状态聚类中心的隶属度,判断电路处于哪一种工作状态,实现容差电路的软故障诊断。实例表明,本文算法能够准确清晰地辨别容差电路的正常状态与故障状态,仅需少量样本即可获得各种状态的典型参数,对容差电路进行客观有效的软故障诊断。      

流量经营时代的大数据处理技术应用研究

移动互联网的快速发展及流量收入占比的快速攀升,促使流量经营成为运营商战略转型的重点。运营商传统数据存储与处理技术无论是从成本、性能还是扩展性等方面都受到了巨大挑战。探讨了流量经营时代运营商引入大数据处理技术的必要性与具体实施方案,并通过实践验证大数据技术带来的效益,以此指导运营商实施大数据解决方案。     

BSS数据集中的相关重要环节分析

基于对运营商BSS现状的分析,主要就BSS数据集中过程中的相关重要环节或要点进行了讨论,包括数据模型的统一、数据同步、数据服务实现的技术选择等。     

数据库财务管理系统中的后台监督

本文借鉴某些大型机上的系统日记的思想,为自己的财务系统建立一个后台监督系统,以解决凭证数据库的数据修改问题以及由此引起的完整性和安全性问题。     

MICROTHREAD BASED （MTB） COARSE GRAINED FAULT TOLERANCE SUPERSCALAR PROCESSOR ARCHITECTURE

Fault tolerance in microprocessor systems has become a popular topic of architecture research. Much work has been done at different levels to accomplish reliability against soft errors, and some fault tolerance architectures have been proposed. But little attention is paid to the thread level superscalar fault tolerance. This letter introduces microthread concept into superscalar processor fault tolerance domain, and puts forward a novel fault tolerance architecture, namely, MicroThread Based （MTB） coarse grained transient fault tolerance superscalar processor architecture, then discusses some detailed implementations.